If you choose the first mode, no creature without flying will be able to block that turn, including creatures that lose flying and creatures without flying that enter the battlefield after Gruul Charm resolves.

1/24/2013

If you choose the second mode, Gruul Charm's effect will override any other control-changing effects on those permanents.

1/24/2013

A token is owned by the player under whose control it entered the battlefield.